Pipe trimming device



July 30, 1935. J. w. FREE PIPE TRIMMING DEVICE Filed Aug. 20, 1929 3Sheets-Sheet l July 30, 1935. J. w. FREE PIPE TRIMMING DEVICE Filed Aug.20, 1929 3 Sheets-Sheet 2 may M July 30, 1935. J. w. FREE 2,009,884

PIPE TRIMMI NG DEVICE Filed Aug. 2o, 1929 s sheets-sheet s @W www4Patented July 30, 1935 UNITED STATES 2,009,884 PIPE TBMMING DEVICE JohnW. Free, Adqllipp,

and Laughlin Pa., assignor to Jones Steel Corporation, Pittsburgh,

Pa., a corporation of Pennsylvania Application August 20, 1929, SerialNo. 387,225

13 Claims.

My invention relates to the manufacture of pipe and, in particular to amachine for trimming the flash from the seams of a length of flashwelded pipe.

When two semi-cylindrical sections are electrically welded to form apipe. the welding is accompanied by the formation of a bead of flashalong the seam both on the inside and the outside of the pipe. Thisflash is objectionable and its removal is necessary to the production ofa finished article. Flash trimming bymeans of hand or pneumatic chiselshas proved unsatisfactory because of the high cost thereof and the lackof uniformity in the work, and because of the diiiiculty of trimminginside the pipe I overcome these objections by a flash trimming machinewhich will remove the flash quickly and uniformly.

The flash trimming machine of my invention comprises, in general, afixed base having pipe supporting means thereon and movable trimmingmeans actuated by suitable driving connections. I also provide means forengaging the inner and outer walls of the pipe on both sides of thewelded seam. Duplicate internal and external trimming means are alsoprovided so that the ash is removed from the inside and outside of thepipe in a single operation.

For a complete understanding of my invention,

to the accompanying drawings in which Figure 1 is a plan view of apreferred form of my invention.

Figure 2 is a side elevation thereof.

Figure 3 is a partial section taken along the line III-III of Figure 2.

Figure 4 is a partial vertical section taken along the line IV-IV ofFigure 3.

Figure 5 is a similar section on the line V-V ofFigure 3.

Figure 6 is a partial side view of a pipe section with the dash trimmersshown in section.

Figure 7 is a partial section of welded pipe showing the seam and theash formed thereon.

Referring in detail to the drawings and particularly to Figures 1 and 2,the flash trimming machine illustrated comprises a fixed base portion I3and a shiftable superstructure II. The base portion is preferably builtup of structural sections I2 supported on foundation members I3. 50'I'he base portion III carries uprights I4 and I5 which are providedwith rolls I6 and I1.

The superstructure II consists of a pair of side arms I3 and I3 and acenter arm or mandrel .23. The side arms I8 and I9 and the center annare rigidly connected at one endby means of a cross head 2|. The sidearms Il and I3 are provided on their lower sides with rack bars 22extending throughout the length thereof which are adapted to cooperatewith pinions 23 mounted on a shaft 24. The side arms Il and 5 I3 rest onthe rolls I6 and Il and longitudinal movement thereof is effected bydriving the pinions 23 from a drive shaft 25 geared to the pinions 23.

The base portion I0 carries a pair of rails 26 which are mounted onblocks 2l resting on the structural members I2. A plurality of rolls 23are journaled in fthe base portion to provide a support for a pipelength 29.

An external tool carrier or yoke 30 is secured 15 to the free ends ofthe arms I8 and I9 by means of bolts 3i. The carrier 30 is provided withwheels 32 which engage the rails 26. A pair of rolls 33 are journaled inthe carrier 30 on a vertical axis so as to engage the pipe section 29.

An internal tool carrier 34 is secured to the free end of the mandrel 20and is provided with a roller 35 which rests on the bottom of the insideof the pipe and horizontal rollers 36 which engage the inside of thepipe at points adjacent 25 those engaged by the rollers 33 journaled inthe external tool carrier. This structure may be more readily observedin Figures 3 and 4.

The tool carrier 30 is provided with external cutters 3l which aremounted in pivoted tool 30 holders 38. Abutments 39 limit the pivotalmovement of the tool holders 38.

Similar cutters 40 adapted to engage the inside of the pipe are securedto pivoted tool holders 4I mounted abutments 42. The tool holders 38 and4I are provided with projections 43 for engaging the pipe 29 on eitherside of the Welded seam in order to provide additional support for thecutters 40 31 and 40.

In operation, the superstructure II is shifted to its extreme right-handposition by means of the drive shaft 25 and the gearing connecting it tothe racks 22. While the carriage comprising 45 the arms I8 and 20 andthe internal and external 30 are in this disposed in the positionillustrated in Figure 2, with one end in engagement with an abutment 44and with the Welded seams in a horizontal plane. The carriage II is thenshifted to the left, the mandrel 20 traversing the inside of the pipe.The pipe wall is engaged between the rollers 36 on the tool carrier 3land the rollers 33 on the carrier 30. By reason of the pivoted mountingof cutters 31 and I0, the latter are swung out of engagement with thepipe as the carriage moves to the left. v

When the carriage has been moved to the left so that the cutters 31 and40 are at the end of the seams, the carriage is stopped and'reversed. As

the carriage moves to the right, movement of the pipe 29 toward theright is prevented by its engagement with the stop or abutment M Thecutters 31 and 40 assume their cutting positions d `termined by theabutments 39 and 42 and the projections 43A on the holders 38 and 4I. Asthe cutters are drawn along the seams, the flash is trimmed from thelatter and a smooth surface at the seams results as shownin Figure 3 andFigure 6. f

The dimensionsof the machine are such that when the carriage Il hasreached its extreme right-hand-position the cutters will have completedthe trimming operation. The position of the tool carriers 30 and 34 atsuch time is indicated in dot and dash lines in Figure 1. The pipe 29 isthen removed and an `untrimmed pipe substituted therefor. l v

Among the numerous advantages which characterize the ash trimmingmachine of my invention may be mentioned the fact that the entiretrimming operation requires only a very short time. The pipe,l beingunder compression during the trimmingoperation, serves as a column towithstand the thrust of the moving carriage. The shape of the pipe incross section is ideally adapted for this type of load;

The projections 43 determine the depth of cut made by the cutters andare designed to preserve a uniform thickness of pipe wall. Because ofthe details ofthe construction hereinbefore described, a uniform surfaceis produced at the welded seam, thel ilash being entirely removedtherefrom.

The fact that the f orce necessary to move the tool carriers is appliedalong the axis of the pipe makes it possible to design thesuperstructure Il of lighter construction than would otherwise berequired.

Although I have illustrated and described but a single embodiment of myinvention, it is not my intention to be limited thereto since myinvention may be practiced in other forms within the scope of theappended claims.

I claim:

l. A flash-trimming machine for double-welded pipe comprising a movablecarriage having side arms and a mandrel adapted to entera pipe lengthreceived between said arms, tool carriers connected to the ends of saidside arms and mandrel, rollers on said carriers adjacently disposed,rolls rfor supporting a double-welded pipe between said side arms andsurrounding said mandrel coaxially therewith, cutting tools on saidcarriers adapted to engage the flash adhering to the seams in said pipe,and means for moving said carriage with respect to said pipe whereby toremove the flash from thel length of said seams in one operation.

2. In a machine for trimming the ash from the seams of welded pipe, ashiftable carriage including an open ended frame movable to embrace alength of pipe,` a mandrel Within the frame and secured thereto at oneend adapted to penetrate a length of pipe embraced by said frame, toolcarriers connected to the Vends of said frame and mandrel remote fromtheir point of connection,

a series of rolls for supporting a welded pipe coaxially with respect tosaid mandrel, rollers on said carriers for engaging said pipe externallyand internally, pivotedcutting tools on said carriers adapted to engagethe ash adhering to the seams in said pipe, and means for moving saidcarriage with respect to said pipe whereby the flash is removed from thelength of said seams in one operation.

3. Apparatus for .trimming flash from axial seams in a welded pipecomprising means for supporting a pipe against axial movement, meanswhereby a pipe may be moved intoengagement with said means, a carriagemovable axially over the pipe, a mandrel for enteringthe pipe, commonmeans for actuating the carriage and mandrel, and means on said carriageand mandrel for removing :dash on movement thereof relative to said pipewhile the latter is supported by said first-mentioned means.

4. Apparatus for trimming flash from welded pipe comprising meanswhereby'a pipe maybe moved into position for the trimming operation,means for supporting the pipe against axial movement in such position, acarriage movable axially over the pipe and a mandrel for entering thepipe vwhile so supported, and means on the mandrel and carriage fortrimming flash, guiding means on the mandrel and carriage and commonoperating vmeans for the mandrel and carriage.

5. Apparatus for working on welded -pipe comprising an abutment, meanswhereby a pipe may be moved against said abutment, a carriage movableaxially over the pipe anda mandrel for entering the pipe while thelatter is adjacent the abutment, common means for actuating the carriageand mandrel, and guide means and cutters on said carriage and mandrelfor engaging the pipe on movement of the carriage and mandrel relativethereto.

6.' Pipe working apparatus comprising a stop, a roll table fordelivering a pipe against said stop, a carriage overlying said table andmovable therealong, a mandrel extensible between said carriage andtable, common operating means for the mandrel and carriage, and cutterscarried by the mandrel and carriage for trimming flash from welded seamsin a pipe resting on said table.

'7. Apparatus for working on welded pipe comprising a stop, a roll tablefor delivering a pipe to a position adjacent said stop, a carriageoverlying a pipe so supported and movable therealong, a mandrel adaptedto enter the pipe movable with said carriage, and means on said mandreland carriage for removing the flash from welded seams in said pipe.

8. Flash trimming apparatus for Welded pipe comprising a stop, aconveyor for delivering a.v

pipe into a position,adjacent the stop, a yoke overlying the pipe insuch position and movable therealong, a mandrel movable with the yokefor entering the pipe, means for actuating the yoke and mandrel, andmeans on the yoke and mandrel for trimming flash from seams'in saidpipe.

9. Apparatus for working welded pipe comprising means for supporting apipe against axial thrust, a substantially semi-cylindrical yoke movablealong a pipe so supported, a mandrel movable with said yoke for enteringthe pipe, guide rolls and cutters on said yoke and mandrel for engagingthe pipe adjacent welded seams therein and trimming flash therefrom,respectively.

10. Flash trimming apparatus for welded pipe comprising an abutment, aroll table for delivering the pipe axially toward said abutment, railsremoving a welded a structure for supporting and ment of the materialrelatively to the ram in placing the seam in position for metal-removingaction.

12. In apparatus surplus metal from seam or the like, material carryingting the surplus for concurrently removing opposite faces of a welded asupporting structure for the the seam, and means for cutmetal from theseam concurrently on opposite faces of including a longitudinallymovable ram each arm,

